diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2018-01-26 01:36:44 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-01-29 12:02:55 -0500 |
| commit | 491847f3b29cef0417a03142b96e2a6dea81cca0 (patch) | |
| tree | 68e92d489b96c65ef2fe4a662d615d9400af3635 /tools/virtio | |
| parent | b4eab7de6685ee2691a7e297d511a126dbf53207 (diff) | |
| download | lwn-491847f3b29cef0417a03142b96e2a6dea81cca0.tar.gz lwn-491847f3b29cef0417a03142b96e2a6dea81cca0.zip | |
tools/virtio: fix smp_mb on x86
Offset 128 overlaps the last word of the redzone.
Use 132 which is always beyond that.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools/virtio')
| -rw-r--r-- | tools/virtio/ringtest/main.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/virtio/ringtest/main.h b/tools/virtio/ringtest/main.h index 593a3289c87d..301d59bfcd0a 100644 --- a/tools/virtio/ringtest/main.h +++ b/tools/virtio/ringtest/main.h @@ -111,7 +111,7 @@ static inline void busy_wait(void) } #if defined(__x86_64__) || defined(__i386__) -#define smp_mb() asm volatile("lock; addl $0,-128(%%rsp)" ::: "memory", "cc") +#define smp_mb() asm volatile("lock; addl $0,-132(%%rsp)" ::: "memory", "cc") #else /* * Not using __ATOMIC_SEQ_CST since gcc docs say they are only synchronized |